ML3 Tape Library and 'mtx' command drive count

Hello,

           I have been using the mtx  command,  under Rocky Linux 8,  to operate a ML£ tape library with two SAS LTO  drives

The relevant  generic SCSI devices are shown by the output of lsscsi .:

[1:0:6:0] tape IBM ULT3580-HH6 KAJ9 /dev/st0 /dev/sg1
[1:0:7:0] tape IBM ULT3580-HH8 N4Q1 /dev/st1 /dev/sg3
[1:0:7:1] mediumx IBM 3573-TL 1500 /dev/sch0 /dev/sg4

However, after the second (LTO-6)   drive was installed it was not recognised by mtx. This is illustrated by he output of mtx compiled with a debug flag enabled::

[root@cs2 ~]# mtx.debug status
0000: 17 00 00 00 9D 12 00 00 00 01 03 E9 00 23 00 65 '.............#.e'
0010: 00 05 00 01 00 01 00 00 20 20 20 20 20 20 '........ '
*sense_page=9d 9d
rawNumStorage= 0 35 rawNumImportExport= 0 5
rawNumTransport=0 1 rawNumDataTransfer=0 1
NumMediumTransport=1
NumStorage=40
NumImportExport=5
NumDataTransfer=1
MaxReadElementStatusData=3568
NumElements=42
Storage Changer /dev/sg4:1 Drives, 40 Slots ( 5 Import/Export )
Data Transfer Element 0:Empty
Storage Element 1:Empty

From above query it can be seen that 35 storage slots  are counted  but only one data transfer slot ( tape drive). Nb the Web  administration  interface shows that both drives are online..   I reset the Library , but this hasn't fixed  the issue.

 I am running mtx version 1.3.12 ; that dates back to 2008 - was wondering i if anyone else has tried using it to operate an ML3?   For the record,  it works well enough for loading and unloading tapes and reading barcodes.